If your bees are off the bog, you can apply Actara and Admire if needed. Cranberry weevils (second generation) are out and abundant in some case. The threshold for spraying is higher for the summer generation; an average of 9 is used to trigger a spray. Remember Actara is Zone II regulated and highly toxic to bees.
Cranberry IPM Message
Altacor should have good residual and rainfastness, if you are concerned about sprays going out in this unstable weather pattern that we currently find ourselves. Please use the traditional cranberry fruitworm timing for Howes, spraying 7-9 days after 50% out-of-bloom. This is still the best management strategy for this variety.
Things seem fairly quiet so far. State Bog is 60-80% IN bloom. The Stevens at Rocky Pond Bog in Miles Standish are 5% out-of-bloom. At State Bog, the Ben Lears were 25% out-of-bloom and the Early Blacks were 13% out-of-bloom mid-week.
You may need to be checking early varieties and hybrid varieties soon for %out-of-bloom. Bloom is moving quickly in some areas. It is always good to get 2 %oob counts BEFORE you hit 50%, just to improve your estimate. Some growers may be spraying for fruitworm control by the end of next week. Late water Howes are very behind and barely at bloom yet.
Just a short message this week. Bloom is coming on strong this past week. It is absolutely the time to be putting out first fungicide. The weather has not been cooperative, so if you haven't yet sprayed, do it as soon as you have a chance. The window for controlling early season insects is closing unless you have really high numbers. We have had reports of 14 spag larvae and 20 weevils.
This is the week of spag. There is, however, no easy answer!
Many growers have been treating with Avaunt over the past few weeks for winter moth or weevil. We learned that gypsy moth sometimes gets through Avaunt, similar to spag getting through. One site had false army, blossom, weevil, bhf on a few pieces plus some spag too with all at, or close to, threshold.
Insect populations continue to be low. However, now is the time to sweep!
Winter moth larvae are easily seen in sweep nets at this time. Populations are not nearly as high as expected this year, but it would be wise to check your own bog. Small gypsy moth, false army worm and even black-headed fireworm have been reported on bogs.
Winter moth larvae were picked up in sweeps last week. There is only a small window of opportunity to get out and sweep this week before the poor weather conditions come in, so try to get out there to see if winter moth is on your bog. Growers were picking up averages of 8-10 larvae last week. They are very small but you should be able to see them.
Some growers are reporting heavy infestations regarding fruit inspection and CFW pressure. Talking with the Ent lab, that concurs with what they are finding. "Most bogs have nothing but 1 in 10 will have a big (heavy) infestation similar to your numbers.